diff --git a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
index 39a76d6..2bd311b 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
@@ -20,12 +20,11 @@
 
 StringRef WinCodeViewLineTables::getFullFilepath(const MDNode *S) {
   assert(S);
-  DIDescriptor D(S);
-  assert((D.isCompileUnit() || D.isFile() || D.isSubprogram() ||
-          D.isLexicalBlockFile() || D.isLexicalBlock()) &&
+  assert((isa<MDCompileUnit>(S) || isa<MDFile>(S) || isa<MDSubprogram>(S) ||
+          isa<MDLexicalBlockBase>(S)) &&
          "Unexpected scope info");
 
-  DIScope Scope(S);
+  DIScope Scope = cast<MDScope>(S);
   StringRef Dir = Scope.getDirectory(),
             Filename = Scope.getFilename();
   char *&Result = DirAndFilenameToFilepathMap[std::make_pair(Dir, Filename)];